<!DOCTYPE html>
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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    
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<script>
    function fn(url){
        var arr = url.split('&&')
        var obj = {}
        arr.forEach((item,index)=>{
            var arrs = arr[index].split('=')
            obj[arrs[0]]=arrs[1]
        })
        return obj
    }
    var str= fn('username=张三&&age=18')
    console.log(str);
</script>